Indian Army BSc Nursing Merit List 2024 (Out) at joinindianarmy.nic.in

Gynoecium MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • Parts of a Flower - Gynoecium is considered one the most difficult concept.

  • 13 Questions around this concept.

Solve by difficulty

Free carpels are called

Concepts Covered - 1

Parts of a Flower - Gynoecium

Parts of a Flower - Gynoecium

  • Gynoecium is the female reproductive whorl of the flower.
  • It is made up of one or more carpels/pistils/megasporophyll.
  • A carpel consists of stigma, style and ovary.
  • Ovary is the enlarged basal part on which the elongated tube called style is present.
  • The style connects the ovary to the stigma.
  • The stigma present at the tip is receptive surface for the pollen grains.
  • Ovary contains one or more ovules attached to a flattened cushion-like placenta. 
  • When more than one one carpels are present and they are free, the condition is called apocarpous, e.g., lotus and rose.
  • When more than one carpels are present and they are fused, the condition is called syncarpous, e.g., mustard and tomato.
  1. Monocarpellary : It is a gynoecium with a single carpel, e.g., Bean.
  2. Bicarpellary : It is the presence of two carpels in a gynoecium. e.g., Helianthus.
  3. Tricarpellary : It is the presence of three carpels in a gynoecium e.g., Cocos.
  4. Tetracarpellary : It is the presence of four carpels in a gynoecium. e.g., Cotton.
  5. Pentacarpellary : It is the presence of five carpels in a gynoecium. e.g., Hibiscus.
  6. Multicarpellary : It is the presence of many carpels in a gynoecium. e.g., Annona.

Locules in the Ovary:

  • The ovary encloses one to many chambers called the locules. Based on the number of locules, the ovary may be described as follows :
  1. Unilocular : Ovary with one locule. e.g., Dolichos.
  2. Bilocular : Ovary with two locules. e.g., Solanum.
  3. Trilocular : Ovary with three locules. e.g., Allium.
  4. Tetralocular : Ovary with four locules. e.g., Datura.
  5. Pentalocular : Ovary with five locules. e.g., Hibiscus.
  6. Multilocular : Ovary with many locules. e.g., Abutilon.

Style:

  • The stalk like-structure present above the ovary is called the style. 
  • The style may be long (Datura) or short (grasses) or absent (Papaver).
  •  In the family umbelliferae (apiaceae) the base of the style is swollen and forms a structure called stylopodium.
  • There are three types of styles as described below :
  1. Terminal style : If the style arises from terminal part of the ovary, it is called terminal style, e.g., Datura, Hibiscus and Solanum.
  2. Lateral style : If the style arises from one side of the ovary, it is called lateral style, e.g., Mango.
  3. Gynobasic style : If the style arises from the base of the ovary it is called gynobasic style, e.g., Ocimum, Salvia.
     

 

 

 

Stigma:

  • The terminal receptive portion of the style is called the stigma. 
  • It receives pollen grains during pollination. 
  • Usually the lobes of the stigma corresponds to the number of carpels. 
  • Accordingly the stigma may be unifid, bifid, trifid, tetrafid, pentafid or multifid.

Types of Stigma:

  • Capitate : Round stigma. e.g., Hibiscus.
  • Forked : Divided stigma. e.g., Tridax.
  • Feathery : Brush like stigma. e.g., Grasses.
     

Study it with Videos

Parts of a Flower - Gynoecium

"Stay in the loop. Receive exam news, study resources, and expert advice!"

Get Answer to all your questions